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ValidationUtils (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.validation
Class ValidationUtils

java.lang.Object
  extended by org.springframework.validation.ValidationUtils

public abstract class ValidationUtils
extends Object

Utility class offering convenient methods for invoking a Validator and for rejecting empty fields.

Checks for an empty field in Validator implementations can thus become one-liners.

Since:
06.05.2003
Author:
Juergen Hoeller, Dmitriy Kopylenko
See Also:
Validator, Errors

Constructor Summary
ValidationUtils()
           
 
Method Summary
static void invokeValidator(Validator validator, Object obj, Errors errors)
          Invoke the given Validator for the supplied object and Errors instance.
static void rejectIfEmpty(Errors errors, String field, String errorCode)
          Reject the given field with the given error code if the value is empty.
static void rejectIfEmpty(Errors errors, String field, String errorCode, Object[] errorArgs, String defaultMessage)
          Reject the given field with the given error code, error arguments and default message if the value is empty.
static void rejectIfEmpty(Errors errors, String field, String errorCode, String defaultMessage)
          Reject the given field with the given error code and default message if the value is empty.
static void rejectIfEmptyOrWhitespace(Errors errors, String field, String errorCode)
          Reject the given field with the given error code if the value is empty or just contains whitespace.
static void rejectIfEmptyOrWhitespace(Errors errors, String field, String errorCode, Object[] errorArgs, String defaultMessage)
          Reject the given field with the given error code, error arguments and default message if the value is empty or just contains whitespace.
static void rejectIfEmptyOrWhitespace(Errors errors, String field, String errorCode, String defaultMessage)
          Reject the given field with the given error code and default message if the value is empty or just contains whitespace.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ValidationUtils

public ValidationUtils()
Method Detail

invokeValidator

public static void invokeValidator(Validator validator,
                                   Object obj,
                                   Errors errors)
Invoke the given Validator for the supplied object and Errors instance.

Parameters:
validator - the Validator to be invoked (must not be null)
obj - the object to bind the parameters to
errors - the Errors instance that should store the errors (must not be null)
Throws:
IllegalArgumentException - if either of the Validator or Errors arguments is null; or if the supplied Validator does not support the validation of the supplied object's type

rejectIfEmpty

public static void rejectIfEmpty(Errors errors,
                                 String field,
                                 String errorCode)
Reject the given field with the given error code if the value is empty.

An 'empty' value in this context means either null or the empty string "".

The object whose field is being validated does not need to be passed in because the Errors instance can resolve field values by itself (it will usually hold an internal reference to the target object).

Parameters:
errors - the Errors instance to register errors on
field - the field name to check
errorCode - the error code, interpretable as message key

rejectIfEmpty

public static void rejectIfEmpty(Errors errors,
                                 String field,
                                 String errorCode,
                                 String defaultMessage)
Reject the given field with the given error code and default message if the value is empty.

An 'empty' value in this context means either null or the empty string "".

The object whose field is being validated does not need to be passed in because the Errors instance can resolve field values by itself (it will usually hold an internal reference to the target object).

Parameters:
errors - the Errors instance to register errors on
field - the field name to check
errorCode - error code, interpretable as message key
defaultMessage - fallback default message

rejectIfEmpty

public static void rejectIfEmpty(Errors errors,
                                 String field,
                                 String errorCode,
                                 Object[] errorArgs,
                                 String defaultMessage)
Reject the given field with the given error code, error arguments and default message if the value is empty.

An 'empty' value in this context means either null or the empty string "".

The object whose field is being validated does not need to be passed in because the Errors instance can resolve field values by itself (it will usually hold an internal reference to the target object).

Parameters:
errors - the Errors instance to register errors on
field - the field name to check
errorCode - the error code, interpretable as message key
errorArgs - the error arguments, for argument binding via MessageFormat (can be null)
defaultMessage - fallback default message

rejectIfEmptyOrWhitespace

public static void rejectIfEmptyOrWhitespace(Errors errors,
                                             String field,
                                             String errorCode)
Reject the given field with the given error code if the value is empty or just contains whitespace.

An 'empty' value in this context means either null, the empty string "", or consisting wholly of whitespace.

The object whose field is being validated does not need to be passed in because the Errors instance can resolve field values by itself (it will usually hold an internal reference to the target object).

Parameters:
errors - the Errors instance to register errors on
field - the field name to check
errorCode - the error code, interpretable as message key

rejectIfEmptyOrWhitespace

public static void rejectIfEmptyOrWhitespace(Errors errors,
                                             String field,
                                             String errorCode,
                                             String defaultMessage)
Reject the given field with the given error code and default message if the value is empty or just contains whitespace.

An 'empty' value in this context means either null, the empty string "", or consisting wholly of whitespace.

The object whose field is being validated does not need to be passed in because the Errors instance can resolve field values by itself (it will usually hold an internal reference to the target object).

Parameters:
errors - the Errors instance to register errors on
field - the field name to check
errorCode - the error code, interpretable as message key
defaultMessage - fallback default message

rejectIfEmptyOrWhitespace

public static void rejectIfEmptyOrWhitespace(Errors errors,
                                             String field,
                                             String errorCode,
                                             Object[] errorArgs,
                                             String defaultMessage)
Reject the given field with the given error code, error arguments and default message if the value is empty or just contains whitespace.

An 'empty' value in this context means either null, the empty string "", or consisting wholly of whitespace.

The object whose field is being validated does not need to be passed in because the Errors instance can resolve field values by itself (it will usually hold an internal reference to the target object).

Parameters:
errors - the Errors instance to register errors on
field - the field name to check
errorCode - the error code, interpretable as message key
errorArgs - the error arguments, for argument binding via MessageFormat (can be null)
defaultMessage - fallback default message
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